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A kind of ethylbenzene dealkylation catalyst and preparation method thereof

A technology of ethylbenzene dealkylation and catalyst, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor activity and diffusion performance, reduced effective utilization of molecular sieves, and influence on catalyst selectivity and Stability and other issues, to avoid the discharge of difficult-to-treat wastewater, the effect of small active particles, and molecular sieve reduction

Active Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst is prepared by a conventional impregnation method, the effective utilization rate of the molecular sieve is reduced, the activity and diffusion performance are deteriorated, and the selectivity and stability of the catalyst are affected.

Method used

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  • A kind of ethylbenzene dealkylation catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation step of catalyst of the present invention is as follows:

[0024] (1) Dissolve chloroplatinic acid containing 1 gram of platinum in 15 grams of water, and 19 grams of mordenite (0.4 microns in particle size, SiO 2 / Al 2 o 3 The molar ratio is 20) and the above solution is fully mixed, and the mixture is dried at 120°C for 16 hours and calcined at 480°C for 4 hours to obtain platinum-loaded mordenite;

[0025] (2) Dissolve 90 grams of water-soluble cornstarch (molecular weight: 35,000) in 300 grams of water, then add 10 grams of the molecular sieve obtained in step (1) at room temperature, fully stir into a uniform suspension, and vacuum spray dry (vacuum The temperature is 0.03MPa, the drying temperature is 60°C, and the drying time is 5h), to obtain a starch-embedded molecular sieve with an average particle diameter of 80 microns;

[0026](3) Mix 20 grams of the starch-embedded molecular sieve prepared in step (2) with 118 grams (dry basis 76wt...

Embodiment 2

[0029] An embodiment of the catalyst of the present invention is the same as in Example 1, except that the substance content in each step is adjusted, the mass ratio of starch to molecular sieve is 5:1, and the starch-embedded molecular sieve with an average particle diameter of 50 microns is prepared. . The composition of the obtained catalyst was Pt: 0.02%, mordenite: 4.0%, and alumina: the balance. See Table 2 for the evaluation results.

Embodiment 3

[0031] An embodiment of the catalyst of the present invention is the same as in Example 1, except that palladium chloride is used to replace chloroplatinic acid in step (1), and the substance content in each step is adjusted, and the mass ratio of starch to molecular sieve is 10:1 , prepared a starch-embedded molecular sieve with an average particle diameter of 100 microns, and obtained a catalyst composition of Pd: 0.5%, mordenite: 0.8%, and alumina: the balance. See Table 2 for the evaluation results.

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Abstract

The invention discloses an ethylbenzene dealkylation catalyst and a preparation method thereof. In the method, the MOR type molecular sieve loaded with active metal components is embedded in the organic matter, then uniformly mixed with the precursor of the high-temperature resistant inert oxide, shaped, dried and calcined to obtain the ethylbenzene dealkylation catalyst. The catalyst of the invention is particularly suitable for the isomerization process of C8 mixed aromatics containing ethylbenzene. Compared with the existing technology, since the molecular sieve used is greatly reduced, not only the production cost of the catalyst is greatly reduced, but also the discharge of difficult-to-treat wastewater in the synthesis process of the molecular sieve is avoided, and it has a higher conversion rate of ethylbenzene and ethylbenzene The conversion of benzene to benzene is characterized by selectivity.

Description

technical field [0001] The invention relates to an ethylbenzene dealkylation catalyst and a preparation method thereof. The catalyst is used for C containing ethylbenzene 8 The isomerization reaction process of mixed aromatics has high conversion rate of ethylbenzene and selectivity of conversion of ethylbenzene to benzene, and at the same time, it can make the product stream contain p-xylene near the equilibrium content. Background technique [0002] In the petrochemical production process, C obtained from various processes 8 Among aromatic hydrocarbons, in addition to p-, m-, and o-xylene, ethylbenzene is also contained. Using this as a raw material, p-xylene products can be obtained through combined operations such as isomerization, rectification and adsorption separation. Since the boiling points of ethylbenzene and xylene are very close, the separation is difficult, resulting in the accumulation of ethylbenzene in the recycle stream of the combined unit, resulting in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/22C07C4/18C07C5/27C07C7/148C07C15/04C07C15/08
CPCY02P20/52
Inventor 徐会青刘全杰贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP
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